https://doi.org/10.1140/epjc/s10052-024-12622-y
Regular Article - Theoretical Physics
Fuzzy dark matter and the dark dimension
1
Department of Physics and Astronomy, Lehman College, City University of New York, 10468, New York, NY, USA
2
Department of Physics, Graduate Center, City University of New York, 10016, New York, NY, USA
3
Department of Astrophysics, American Museum of Natural History, 10024, New York, NY, USA
4
Laboratoire de Physique Théorique et Hautes Énergies-LPTHE Sorbonne Université, CNRS, 4 Place Jussieu, 75005, Paris, France
5
Max-Planck-Institut für Physik, Werner-Heisenberg-Institut, 80805, Munich, Germany
6
Arnold Sommerfeld Center for Theoretical Physics, Ludwig-Maximilians-Universität München, 80333, Munich, Germany
Received:
24
November
2023
Accepted:
25
February
2024
Published online:
15
March
2024
We propose a new dark matter contender within the context of the so-called “dark dimension”, an innovative 5-dimensional construct that has a compact space with characteristic length-scale in the micron range. The new dark matter candidate is the radion, a bulk scalar field whose quintessence-like potential drives an inflationary phase described by a 5-dimensional de Sitter (or approximate) solution of Einstein equations. We show that the radion could be ultralight and thereby serve as a fuzzy dark matter candidate. We advocate a simple cosmological production mechanism bringing into play unstable Kaluza–Klein graviton towers which are fueled by the decay of the inflaton.
© The Author(s) 2024
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